Rowing machine



FIG. 1 is a perspective view of a rowing machine showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view of a modified embodiment of the design shown in FIGS. 1 through 6. 

The ornamental design for a rowing machine, substantially as shown and described. 